Answer
For splintered deck boards, sand dry wood with 60 or 80, then smooth with 100 or 120 before sealing.
Why it happens
Outdoor wood fibers lift and break down from wear, moisture, and sun exposure.
Recommended grit
Use 60 or 80 for heavy splinters, then 100 or 120 for smoother prep.
Wet or dry
Dry after the wood is fully dry.
Success check
The boards feel smoother and no loose splinters remain.
What to do
- Let the deck boards dry completely.
- Remove heavy splinters with 60 or 80.
- Smooth with 100 or 120.
- Clean dust before stain or sealer.
Avoid: Do not sand wet deck boards.